Motor for sewing-machines



(No Model.) 2 Sheets-Sheet 1.

H. A. PRANTZ.

MOTOR FOR SEWING MACHINES.

No. 491,751. Patented Feb. 14, 1893.

um Meow 33n fl tbomwl (No Model.) 2 Sheets-Sheet 2.

H.'A.PRANTZ. MOTOR FOR SEWING MACHINES. No. 491,751. PatntedPeb. 14,1893.-

mr, Norms Pi ERS co. PHQTO-UTHQ, WASHNGTON. n c.

UNITED STATES PATENT OFFICE.

HIRAM A. FRANTZ, OF TAMAQUA, PENNSYLVANIA.

MOTOR FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 491,751, dated February14, 1893.

$erial No. 430,830. (No model.)

To all whom it may concern:

Be it known that I, HIRAM A. FRANTZ, a citizen of the United States ofAmerica, residing at Tamaqua, in the county of Schuylkill and State ofPennsylvania, have invented certain new and useful Improvements inMotors for Sewing-Machines, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in motorsfor sewing machines, and has for its obj ect,primarily, to provide amotor capable of being attached to difierent styles of sewing machines,whether the fiy-wheel is within or without the framework or stand.

A further object is to provide a motor of this class possessingadvantages in point of simplicity, durability, and general efficiency.

The invention comprises the detail of construction, combination andarrangement of parts, substantially as hereinafter fully set forth andparticularly pointed out in the claims.

In the accompanying drawingsz Figure 1 is an end elevation of a sewingmachine pro vided with my improved motor, the fiy-wheel being shown onthe outside of the frame or stand. Fig. 2 is a sectional view with thewheel on the inside of said frame or stand. Fig. 3 is a verticalsectional view of the flywheel. Fig. 4 is a sectional view on the lineocx, Fig. 2. Fig. 5 is a detail view of the brake.

Referring to the drawings, A designates the frame or stand of a sewingmachine, and a the fly-wheel thereof, which, in Fig. 1, is shown asmounted on a stationary stud or axle a. on the outside of frame or standA, while in Fig. 2 it is shown on the inside of said stand or frame, andits axle a free to revolve therewith. Around this fly-wheel the strap Sfor driving the sewing machine mechanism is passed. As shown in Fig. 1 asprocket wheel a is removably secured to the hub of fiywheel a. on theoutside thereof, while in Fig. 2 a sprocket wheel a is rigidly securedon shaft a B designates the pedal, to which pitman b is pivotallyconnected, said pitman being formed in two sections 1), 6 The section bis pivotally secured at its upper end to a brake bar 19 having a blockor shoe 7), which when lowered will bind strap S against a projection bof the top of frame or stand A, and thus hold said strap and preventfurther movement of the sewing machine mechanism. .The brake bar b ispivotally connected to the projection b and is provided with a series ofholes or apertures I) so that it can be connected to the pitman ofsewing machines of different sizes. A coil spring connected at its lowerend to frame or stand A, and at its upper end to pitman b serves tonormally hold the brake-block or shoe 19 against strap S.

C is a frame composed of two parallel members d, (I, connected togetherat their upper and lower ends, and having a lower arm d, and a bracket61 extending from one side. This frame is removably secured to frame orstand A by means of upper and lower rods D having bent or angular endsprojected through the socketed ends of said frame G, and held firmlyagainst the legs of frame or stand A by clamps D. These clamps arepreferably composed of two parallel blocks 6 through holes or aperturesin which are passed nutted bolts 6'. By this means the sewing machinestand or frame is not defaced and the motor attachment can be readilyapplied or removed.

E is the main motor wheel, provided on its periphery with two sets ofteeth c c and one of its sides e is made integral therewith, while theother side e is removable. The shaft or axle f of this wheel E issupported at its ends by the parallel members (1, d, of frame 0, and tothis shaft or axle is secured the inner end of a coil spring f, theouter end thereof being attached to the inner surface of the rim ofwheel E. Upon shaft or axle f is rigidly secured a ratchet wheel f withwhich is designed to engage a pawl f pivoted at f to one of the memberscl, said pawl being held in engagement with said ratchet wheel by aspring f bearing thereagainst andheld at f G to said member d. Anelastic stop f attached to or projecting from member at limits theinward movement of pawl f A gear-wheelFis also secured upon shaft oraxle f adjacent to the inner side of wheel E, and with it is designed toengage a gear-wheel or pinion g mounted on a shaft g supported by theouter end of bracket (P. To this shaft is secured a crankhandle g bymeans of which the spring f can be wound or tightened. The wheel orpinion g is preferably about half the diameter of wheel F.

In the outer end of arm cl of frame 0 is mounted a shaft G, upon which,according to the construction shown in Fig. 1, is rigidly secured asprocket wheel it around which is passed a chain h, which alsoencompasses sprocket wheel a on the hub of fly-wheel a. Also upon thisshaft G is keyed a gear-wheel 71 which in this instance engages orintermeshes with the inner set of teeth 6 of the main motor-wheel E, andwhenever, for any reason, the fly-wheel is placed on the inside of themachine frame, the gear-wheel k must be adjusted to mesh with the outerset of teeth 6 of said main motor wheel. In Fig. 2 the sprocket wheel his shown on the inner end of shaft G, and the chain h is passed aroundsprocket wheel a on the shaft a of fly-wheel a, and the gear-wheel 71 isin engagement with the outer set of teeth 6 of wheel E. A shield Hindicated by dotted lines is preferably secured to frame 0 so as toinclose the outer portion of the motor to protect the clothes of theoperator from contact therewith. To the inner sprocket Wheel a thepitman I) can be connected when the motor is not in use. For thispurpose said sprocket wheel is provided with a lug or projection 1) towhich the member I) of pitman b is pivotally connected by a nutted bolt2" passed through coincident eyes. If it be desired to connect thepitman directly to the fly-wheel, as when the latter is journaled on astationary stud or shaft, the lower member of said pitman can bepivotally connected to a stud 2' of said wheel, facing inward, ascustomary.

From what has been said it will be seen that by removing the brake fromthe main operating strap the motor will impart motion to the fly-wheelof the sewing machine, and also that the motor can be connected to anystyle of sewing machine now in use whether the flywheel be on the insideor outside of the frame or stand, or whether it be mounted on a rotaryor rigid axle or bearing. A motor thus constructed is extremely simpleand inexpensive, and is not liable to get out of order or be deranged.

I claim as my invention:

1. The herein-described improved sewing machine motor, comprising, incombination with the fiy-wheel of a sewing machine and a sprocket wheelmoving therewith, the frame removably secured to said sewing machine,the spring-impelled wheel having its axle or shaft mounted therein andhaving two sets of teeth on its periphery, the shaft supported by saidframe having a gear-wheel in engagement with said teeth of thespring-impelled wheel, the sprocket wheel on said shaft, and the chainencompassing said latter wheel also the sprocket-wheel movable with saidfly-wheel the pedal, the pitman secured thereto, and the brake to whichsaid pitman is secured, substantially as set forth.

2. The herein-described improved sewing machine motor, comprising, incombination with the fly-wheel of a sewing machine, and a sprocket wheelmoving therewith, the frame removably secured to said sewing machine,the spring-impelled wheel mounted in said frame and having two sets ofteeth in its pefly-wheel, and a sprocket wheel moving there- W with, ofa motor having a frame supporting or holding its mechanism, the arms orrods supporting said frame and removably secured to said sewing machine,the driving sprocket wheel, the chain encompassing the same and saidsprocket wheel of the sewing machine the pedal, the pitman securedthereto, and the brake to which said pitman is secured, substantially asset forth.

4. The combination with a sewing machine fly-wheel, and a sprocket-wheelmoving therewith, of a motor adjustably secured to said sewing machineand comprising the frame, the spring-impelled wheel having its shaft oraxle supported by said frame, the spring secured to said shaft or axleand to said wheel, the gear wheel on said shaft or axle, the pinionengaging therewith having its shaft provided with a crank-handle, theratchet wheel on the shaft of said spring-impelled wheel, the pawlengaging said ratchet-wheel, the shaft having a gear wheel engagingteeth of said spring impelled wheeh the sprocket wheel also on saidshaft, and the chain encompassing said latter wheel and the sprocketwheel moving with said fly-wheel, substantially as set forth.

5. The combination with asewing machine fly-Wheel, a strap encirclingthe same, and a motor for driving said fly-wheel, of the pedal, thepitman connected thereto, and the brake to which said pitman is securedand having a block or shoe designed to bind and hold said strap,substantially as set forth.

6. The combination, with asewing machine fly wheel, an encirclingdriving strap, a mo tor for driving said fly wheel, a dependingprojection adjacent to said strap, of the pedal, the brake-arm pivotedto said projection and having a block or shoe designed to bind saidstrap against said projection, the pitman connection between saidbrake-arm and pedal, and the spring for normally holding said block orshoe against said strap, substantially as set forth. a a

In testimony whereof Iaflix my signature in presence of two witnesses.

HIRAM A. FRANTZ.

Witnesses:

T. H. OOOMBE, LEW. I. BAOHMAN.

IIO

